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Texas Instruments LM2831YSD
- Part No.:
- LM2831YSD
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2831YSD.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,690
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Product details
Overview
LM2831YSD from Texas Instruments is a monolithic, current-mode PWM step-down DC-DC regulator in a 6-pin LLP package, delivering up to 1.5A output current with 0.55 MHz switching frequency, 0.6V ±2% internal reference, and 150 mΩ PMOS switch resistance - designed for compact local power conversion in USB-powered devices and set-top boxes.
For engineers reviewing the LM2831YSD datasheet, LM2831YSD pinout, LM2831YSD application, or LM2831YSD equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions for LLP-6 layout, confirmed alternatives with functional trade-offs, and supply support for industrial embedded and connected-device programs.
Technical Context
The LM2831YSD implements fixed-frequency current-mode control with internal compensation, enabling stable regulation across 3V–5.5V input and 0.6V–4.5V output ranges without external loop components. Its 0.55 MHz switching frequency supports use of standard 4.7 µH inductors and ceramic capacitors while maintaining fast transient response.
It integrates thermal shutdown (165°C), cycle-by-cycle current limiting (1.8A min / 2.5A typ), undervoltage lockout (2.73V rising threshold), and output overvoltage protection (15% above VFB). The 6-pin LLP package features separate VIND and VINA pins for optimized power/ground separation and low thermal impedance via exposed DAP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 0.55 MHz - enables use of standard 4.7 µH shielded inductors and reduces EMI filtering burden vs. higher-frequency variants. |
| Output Current | 1.5 A continuous - sufficient for powering core logic in HDDs, USB peripherals, and DSL modems without external boost stages. |
| Input Voltage Range | 3.0 V to 5.5 V - matches USB 5V bus and single-cell Li-ion + LDO pre-regulation systems. |
| Output Voltage Range | 0.6 V to 4.5 V - supports modern low-voltage processors (e.g., 1.2V, 1.8V, 3.3V) via resistor divider on FB pin. |
| Internal Reference | 0.600 V ±2% - sets absolute accuracy limit for output voltage; combined with 0.1 nA FB bias current, enables high-precision feedback networks. |
| PMOS RDS(ON) | 150 mΩ (LLP-6) - lower than SOT23-5 variant (130 mΩ), but offset by superior thermal performance (θJA = 80°C/W vs. 118°C/W). |
| Quiescent Current | 2.8–4.5 mA (active), 30 nA (shutdown) - enables ultra-low standby power in battery-backed or always-on USB devices. |
Pinout & Package
The LM2831YSD is housed in a thermally enhanced 6-pin LLP (Leadless Leadframe Package) with exposed die attach pad (DAP) for PCB ground connection. This package provides 80°C/W junction-to-ambient thermal resistance under standard 2-oz copper 4-layer board conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback input | High-impedance node (0.1–100 nA bias) sensing output voltage via resistor divider; trace must be short and noise-isolated. |
| 2 (GND) | Signal and power ground | Primary return path for feedback network; place bottom resistor of divider adjacent to this pin to minimize ground bounce. |
| 3 (SW) | Switch node | Connects to inductor and catch diode anode; carries high di/dt AC current - requires short, wide routing and tight coupling to GND. |
| 4 (VIND) | Power input supply | Delivers current to internal PMOS switch; decouple with ≥22 µF ceramic capacitor placed near this pin and GND. |
| 5 (VINA) | Control circuitry supply | Powers internal bias, oscillator, and error amplifier; must be tied to VIND on PCB - not a separate rail. |
| 6 (EN) | Enable control | Logic-high active input (1.8V threshold); floating or >VINA+0.3V risks malfunction; supports sequencing and standby control. |
| DAP | Die attach pad | Exposed thermal pad - must be soldered to solid GND plane with ≥4 thermal vias to achieve rated θJA and prevent thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables inherent cycle-by-cycle current limiting and stable operation with minimal external compensation - no type-II/III loop filters required. |
| Internal soft-start (≈600 µs) | Prevents inrush current during power-up by ramping VREF from 0V to 0.6V - eliminates need for external soft-start timing components. |
| Thermal shutdown (165°C) | Protects against sustained overload or poor heatsinking; device resumes operation only after junction cools to ≈150°C - prevents latch-up. |
| Output overvoltage protection | Disables switch if FB exceeds 0.69V (15% above 0.6V reference), safeguarding downstream loads during feedback divider failure. |
| Ultra-low shutdown current (30 nA) | Permits long-term battery operation in USB suspend modes or always-on IoT edge nodes without significant drain. |
Applications
| USB-Powered Devices | Set-Top Boxes |
|---|---|
Use Scenario: Powering HDMI interface ICs, tuners, and demodulators from a 5V USB-C port in portable media adapters. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5V USB input to stable 3.3V/1.8V rails for digital signal processing and memory interfaces. Use Value: 0.55 MHz switching allows use of cost-effective 4.7 µH inductors and avoids RF interference in sensitive video/audio bands. |
Use Scenario: Generating core voltage for SoC and DDR memory in consumer IPTV hardware with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Local DC/DC converter supplying 1.2V at 1.5A to processor cores, replacing less efficient linear regulators. Use Value: 150 mΩ RDS(ON) and 93% peak efficiency reduce thermal load in sealed enclosures without forced airflow. |
| HDD Core Power | DSL Modems |
Use Scenario: Delivering regulated 1.2V to spindle motor controllers and SATA PHYs in external 2.5" hard drives powered via USB 3.0. IC Role / Device Role / Timing Role: High-current buck regulator managing dynamic load transients during spin-up and data access bursts. Use Value: Current-mode control and internal compensation ensure stability across wide temperature range (−40°C to +125°C). |
Use Scenario: Providing clean 3.3V supply to ADSL line drivers and Ethernet PHYs in residential broadband gateways. IC Role / Device Role / Timing Role: Secondary regulator stepping down 5V system rail to isolated analog/digital domains with low noise and ripple. Use Value: 0.6V reference tolerance (±2%) and <0.02%/V line regulation maintain voltage accuracy despite upstream LDO dropout variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2831XSD | 1.6 MHz switching frequency; 130 mΩ RDS(ON) (SOT23-5); same LLP-6 package but different frequency bin. | Better suited for ultra-compact designs requiring smallest possible inductors (e.g., ≤2.2 µH), but higher switching losses reduce efficiency at >1A loads. | Select LM2831XSD when board area is critical and thermal headroom permits higher-frequency operation. |
| TPS62231DRVR | 3 MHz fixed frequency; 0.55V reference; 1.8A output; 225 mΩ HS-FET; integrated sync rectifier; smaller 6-pin WSON package. | Supports higher output current and eliminates external catch diode, but lacks OVP and has tighter input range (2.05–6.5V). | Choose TPS62231DRVR for designs needing higher current, reduced BOM count, and footprint savings - verify OVP requirement first. |
Compared with LM2831XSD and TPS62231DRVR, the LM2831YSD offers optimal balance of thermal performance (LLP-6 + DAP), proven reliability in USB 5V systems, and built-in protections (OVP, UVLO, thermal shutdown) without increasing component count - making it preferred for cost-sensitive, thermally constrained consumer electronics.
Availability
LM2831YSD is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, HDD core power, and DSL modems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2831YSD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency DC-DC conversion.
The LM2831YSD belongs to TI's high-frequency buck regulator product line, engineered specifically for space-constrained, USB-fed, and thermally sensitive applications where 0.55 MHz operation, integrated protection, and LLP-6 thermal performance deliver measurable design advantages.
FAQ
What is the maximum output current capability of the LM2831YSD?
The LM2831YSD is rated for 1.5 A continuous output current under typical operating conditions (TJ ≤ 125°C, 5V input, 3.3V output). Its current limit is guaranteed at 1.8 A minimum and typically reaches 2.5 A, allowing brief transient surges beyond nominal rating without fault. Thermal performance depends on PCB layout - proper DAP grounding and thermal vias are essential to sustain full load.
Does the LM2831YSD require external compensation components?
No, the LM2831YSD uses internal compensation and current-mode control architecture, eliminating the need for external compensation networks. This simplifies design, reduces BOM count, and ensures stable operation across its full input (3V–5.5V) and output (0.6V–4.5V) ranges with standard ceramic output capacitors - verified in TI's application notes and design examples.
How does the LM2831YSD differ from the LM2831XSD and LM2831ZSD variants?
The LM2831YSD operates at 0.55 MHz, while LM2831XSD runs at 1.6 MHz and LM2831ZSD at 3.0 MHz. All share identical pinouts in LLP-6 packaging, but differ in switching frequency, RDS(ON) (150 mΩ for YSD vs. 130 mΩ for XSD), and quiescent current. Frequency selection directly impacts inductor size, efficiency profile, and EMI behavior - YSD prioritizes thermal margin and mid-range efficiency over minimal footprint.
Can the LM2831YSD be used with an input voltage below 3.0V?
No - the LM2831YSD has a specified input operating range of 3.0 V to 5.5 V. Below 3.0 V, undervoltage lockout (UVLO) disables operation; the rising threshold is 2.73 V (typ), with 430 mV hysteresis. Attempting operation below 3.0 V risks unstable regulation or complete shutdown, and absolute maximum rating for VIN is −0.5 V to 7 V - not a functional range.
What is the purpose of the separate VIND and VINA pins on the LM2831YSD?
VIND supplies current to the internal PMOS switch, while VINA powers the control circuitry (oscillator, error amplifier, logic). They must be connected together on the PCB to ensure proper biasing - separating them is not supported. This dual-pin structure improves noise isolation between power and signal paths within the die, enhancing regulation accuracy and EMI robustness compared to single-supply buck ICs.
LM2831YSD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 4.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2831YSD FAQ
1.How can I place an order for LM2831YSD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831YSD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2831YSD reliable?
The price and inventory of LM2831YSD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831YSD is usually 5 days.
3.What payment methods are accepted for LM2831YSD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831YSD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831YSD?
LM2831YSD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831YSD order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2831YSD?
For technical support, including LM2831YSD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831YSD requirements.
6.How does Aetrix verify that LM2831YSD is sourced from the original manufacturer or authorized distributors?
All LM2831YSD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2831YSD meets industry standards.
7.What is the process for return or replacement of LM2831YSD?
All LM2831YSD units undergo pre-shipment inspection (PSI). If there is an issue with LM2831YSD, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2831YSD part is unused and in its original packaging.
Return procedure for LM2831YSD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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